hoyne: timber, as we all know, just doesn't hold up well to a lack of maintenance, and then this harsh environment. and if you have a couple pieces of wood that you sandwich together, and moisture gets trapped in there, that's where we tend to find the rot. so rot of the timber is the single largest issue that we're faced with. many of them are on the dirt roads. the vehicles track in the sand, in the wintertime, that sand and wood gets wet, and if you don't clean that sand, it, again, traps the moisture. so, whether it's cleaning the sand, fixing the roof, fixing the siding, all these activities lead towards preventing moisture from getting at the bridge. if the bridge is covered and it's halfway decently taken care of, it'll outlast concrete bridges two or three times. the lifespan of a wooden bridge is actually indefinite.